I rather like RobertGrossblatt?'s variation: theory and reality are only theoretically related. It's vastly more succinct and far more pithy.

Clearly what we need is a theory compiler that automatically transforms to practice on its output! -- DougMerritt (a big fan of automation and compilers, but a little hazy on practicality, thus the wish)

The predictive nature of theory is dependent upon how well the future observations reflect the past data selected for validation. The more the future differs from the past, the greater uncertainty surrounds the prediction.

I really need to graduate. I've lost the ability to discern theory from practice